Ultra short wave conductor



J lly 28, 1936. os os 2,048,752

ULTRA SHORT WAVE CONDUCTOR F iled June so, 1952 INVENTOR MfNDfL 06/1/05 ATTORNEY Patented July 28, 1936 UNITED STATES PATENT OFFICE ULTRA SHORT WAVE CONDUCTOR Germany Application June 30, 1932. Serial No. 620,279 In Germany July 27, 1931 Claims.

This invention relates to an improved ultra short wave conductor.

An object of this invention is to provide a conductor which is particularly adapted to short 5 wave circuits, such as, for example, a Barkhausen ultra short wave oscillator.

According to the invention disclosed in German Patent No. 515,472, corresponding to United States Patent No. 2,031,846, granted February 25,

1936, in order to render the frequency of oscillation independent of the temperature, the conductor parts of the oscillator circuits are formed in such a way that the surface of an insulation body having a temperature coeflicient of expansion of negligibly small value, such as quartz, glass,

quartz-glass, porcelain, or the like, are completely or partly coated with metal. Experiments have shown that apparatus thus built exhibit rather large damping for very short waves.

The present invention is an improvement on United States Patent No. 2,031,846, supra, and is based upon an understanding that such undue damping is not so much due to the additional losses of current occasioned by skin effect, but rather by the dielectric losses of the insulation body. In the light of this discovery the insulation body having a metallic coating according to this invention is made tubular. The tube may have the shape of a rod, or of a flat or cylindrical spiral or the like.

Referring now to the drawing, l and 2 represent the improved tubular conductor of this invention comprising an insulation body of the class described above having a temperature ooeflicient of negligible value and coated by a highly conductive layer of metal, such as silver in a Barkhausen oscillator circuit, 3 and 4 indicate fixed condensers, 5 the grid of an oscillator tube, 6 the plate of the oscillator tube, 1 and 8 are the coupling transformer windings, 9 indicates a grid battery, and ID the filament heating battery, II the filament resistor, and I2 the filament of the oscillator vacuum tube.

While the showing of this improved conductor is shown and described as a conductor employed in a high frequency oscillator circuit, it is to be understood that it is capable of use in other forms, such as an inductance or choke coil, Within the spirit and scope of the appended claims.

I claim:

1. In an ultra short wave circuit, an electron discharge device oscillator and a conductor in circuit with said oscillator comprising a tubular insulating body of non-conducting material possessing a negligibly low temperature coeflicient 10 and a continuous layer of highly conducting material superposed on said insulating material.

2. A circuit as defined in claim 1 characterized in this that said conducting material comprises silver.

3. An ultra high frequency oscillation circuit comprising a short wave electron discharge device oscillator with whose electrodes are coupled electrical conducting elements having a tubular base of hard, solid, non-conducting material possessing an extremely small coeiiicient of thermal expansion and a continuous layer of highly conducting material superposed on said tubular base.

4. In combination, a short wave electron discharge device oscillator having an anode, cathode and grid, current supply means for maintaining said grid at a high positive potential relative to said anode and cathode whereby pendular motion of electrodes is obtained about said grid in the Barkhausen-Kurz manner, a conductor coupled 30 to said grid and a conductor coupled to said anode, said conductors comprising tubular insulating bodies of non-conducting material possessing negligibly low temperature coeflicients and a continuous layer of highly conducting material superposed on said insulating material.

5. In a radio frequency oscillation circuit, an electron discharge device having an electrode to which is coupled a conductor adapted to be traversed by the high frequency currents, said conductor having a hollow core of material of a low coefficient of thermal expansion and a continuous layer of highly conductive material superposed on and fixed to said core.

M NDEL OS 45. 

